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seen Aug 30 '12 at 9:57

Dec
18
awarded  Popular Question
Aug
20
awarded  Supporter
Aug
20
accepted NonlinearModelFit Problem
Aug
20
comment NonlinearModelFit Problem
Thank you again. I can't really give you more data, since this data is the result of a quantum chemical calculation and because of the periodicity I would just get the same data again for the next period (accuracy about 0.0000002). Just if you are interested: The data represents the absolute Energy [Hartree] of a ethylene dichloride molecule as a function of the Dihedral angle Cl-C-C-Cl. I did a little literature research and found that all the models you suggested here were at least once used to fit similar data in some papers. You are doing a great job in this forum, I much appreciate it.
Aug
20
awarded  Scholar
Aug
20
awarded  Student
Aug
19
comment NonlinearModelFit Problem
Wow, thank you! This is realy impressive and helped me out a lot. I will tell my supervisor ;)
Aug
19
comment NonlinearModelFit Problem
Thanks for your helpful answer. You are right, the model seems to be very bad to aproximate the data. But my supervisor told me to use this model. The addition of a gaussian-function does not help much because the function is supposed to be periodic (T=360), i forgot to mention that.
Aug
18
asked NonlinearModelFit Problem